Honestly, I know EXACTLY how you feel. I've never seen anyone (or heard) describe my own feelings so exactly. I feel alone when I am in a crowded room! Mostly because I'm fairly sure that pretty much no one on earth understands me and the way my brain works and the way I think and feel. Pretty much the only time I do relate (or at least can interact without having a panic attack) with others in when I am in a position where I know something that they don't (i.e. a teacher/pupil) type situation. Otherwise I feel extremely inadequate and very weird. Exactly like you said about the sore thumb. I've never even been able to wear make up or anything too attention getting because it makes me feel like I'm 10 feet tall with a spotlight over my head saying to everyone "LOOK AT ME!!", which is the last thing in the world I want.